Brake mechanism



BRAKE MECHANISII Filed Sept. 24, 1930 Inventar STEVE SCHNELL J-J '1ry Patentecl Mag; 31, 1932 UNITED STA'IES PATENT OFFICE STEVE SCHNELL, ST. LOUIS, MISSOURI, ASSIG1IOR '10 WAGNER ELEC'IBIC CORIORA- TIIN', OF S T. LOUIS, MISSOURI, A CORPORA'I'ION OF DELAWARE IB'RAKE MECHANISM Application filed September 24, 1930. Serlal N0. 483,984.

My invention relates to brake mechanisms, it-s object being 130 secure simplification and reduction of cost without sacrifice of durability 0r efllciency and to provide improved means for adjusting the ml position 0f the brake shoes to compensute for brake lining wear.

In the accornpanying drawings Figure 1 is a side elevational view of braking apparzxtus emboclying mv invention (the brake drum being omitt-edj F igure 2 is a vertical cross sectional view 011 the line 22 0f F igure 1 (the brake drum being also shown in eross section); Figure 3 is a cross sectional view of the shoes and supporting means taken along the line 3-3 0f Figure l; Fi ure 4 is a side' elevation of the ends 0f the s oes and a portion 0f the backing plate, the shoe supporting pins being shown in section; am]. Fig ure 5 is a cross seetional view along the line 5-5 of Figure 1.

As indicated in Figures 2 and 5, the brake shoesl 1 are T-sha ed in cross section and are ca.rried by a bac g 0x supporting plate 2 by pivot means cooperating with their ends.

These pivot means are illustrated more in detail in Figures 3 and 4 and comgrise circular bearingcollars 3 rotatively tting in openingsint webe. The backing plete is provided with a pressed-up ortion 5 against which col1ars 3 are a1dapted to be clamped. This ressedup ortion lies adjacent to the webs of the shoes throughout the ma'or portion of their length, as indicated in F1gures 1 and .Z, thus forming an abutment preventing lateral motion of the free ends of the shoes in one direction. The collars 3, which form bearings for the shoes, are held in position by Pins 6 passing through the ortion 5 of the backing late, and preferably these Pins also carry t e late 7 which constitutes means-for lateral y retaining the shoes on the collars.

The pins 6 are provided with square or angular portions 8 cooperating with eccentrical y positidned angular open1ngs in the collars 3 t0 establish non-rotative relation between the pin s and collars. As the result of the eccentnc1ty of the axe's of the ins t0 the e ends of the webs 4 of the shoes, and of slightly greater thickness than the centers of the collars, the rotation of a pin in its opening in the backing plate 5 adjusts the position of the end of its shoe t0 produce Y the desired off position clearance between the brake lining and the drum 15. \Vhen t-he shoes are pr0per1y positioned the collars are 'firmly clan1ped between the backing plate 5 und the retainer plute 7, by drawing up nuts 9. F01 convenience in rotating the pins for ll1e. purposes of shoe adjustment their ends fll'( flattenecl as at 10.

As shmvn in Figuros 1 und 5, ad?ustment stops 211e mounted n the backing p ate near the furwnrd en ls uf tl1e shoes, these stops mmprising the pin 11 eccentrically carrying tl1e st0p disk 12. These pins also carry the retaincr disks 13 which extend over and ahnt the. sidcs of the webe of the shoes opposite the baeking plate and thereby lateral movement of the free en ls ofthe shoes is prevented and twisting strain on the pivot bearings of the shoes, during brake zappliczition, is avoided. The structure described thus makes it possible to properly support the shoes on a narrow pivot bearing of not substantially greater width than the thickness of the webs of the shoes and renders unnecessary attachment of any part to the sh0e web to form its pivot bearing, or reinforcement of the backing plate adjacent the pivots since it lies closely adjacent the line of thrust of the shoe. The collar 3 may be made of brass or other nonrusting material to avoid binding 0f the pivot j oints and thus the necessity of applying separate bushing to the shoes is avoided.

VVhile the drawings illustrate hydraulic shoe actuating means 14, it will be understood that my invention is not limited to any particular type of shoeactuating mechanism.

Havin fully described my invexition, wha.t I c aim as new and desire to secure by Letters Patent ofjshe United stetes is:

1. A brake shoe mounting comprising a supporting platze, a shoe supporting pin carried b seid plate, a shoe supportm collar separa le from the pin und 'mounte eeeentrically thereon und rotatable therewith, und releasable means for clamping said collar in nomrotative relation with said late, seid means comprising a retainer-merner Carried said in und (extending beyond the periphri y of s?aid collar to retain the shoe therem 4 brake mechanism, a. brake shoe sub- 5 sinntially T-shaped in cross section, a.nd a bncking plate having a portion lterallg abutting the web of the shoe thronghqut t e major portion of its length und carry1ng a pivot support therefor.

1 3. In brake mechanis xn a. brake shoe substuxtinlly T-shaped in cross section, a. backing platze having a portion laterally abutting thc Web of the shoe throughout the major portion of its length und carrying a pivot sup rt therefor, und a retainer ctirried by thecking plante und positioned on the side cf the web op osite sa1d platze a;t a point removed from tbe shoe pivot whereby the retsiner und backing plate coo erate to prevent lateral movement of the ree end of the 4. A mounting for T-section brake shoo conprising a. supportin plate havin a portion abuttm the web o. the shoe an carryl ing 1 rotata le anchor pin, a bearing collar sapnrnble from the pin and eccentrically mounted thereon to rotate therewith und extending through und rotatively supporting the web of the shoe, a shoe retaining eleme'nt can-ied by the pin und bearing on the si'de of s1id collar opposite the supporting plate, und menns including said pin for clamping the benring collar between the plate und sh0e retuiner to maintain it in a selected one of its rotative itions.

5. Bra e mechanism comprising u drum und a T-section brake shoe cooperating therewith, a closure plate for the drum having a depressed portion abutting the web of the 0 bnke shoe at one end und throughout a substantilll portion of its length, a pivot pin extending through the closure plate and the web of the shoe und carrying a bearing disk on which said web is mounted, said disk .having a width only slightly greater than the thicknass of said web, und a shoe retainer element pn said pin maintaining the shoe on the bear testimony wheredf, I hereunto aflix my signature, this 18th day of September, 1930.

STEVE SCHNELL. 

